A non-ferrous metal abrasive particle differentiation and detection device, its manufacturing method and detection method

Abstract

This invention provides a non-ferrous metal abrasive particle differentiation and detection device, its manufacturing method, and its detection method. The device includes an asymmetric three-coil sensor, a signal processing circuit, a waveform generator, a data acquisition unit, and a computer. The asymmetric three-coil sensor comprises a glass substrate and a chip body. The chip body includes an oil inlet, a PDMS substrate, a microchannel, an oil outlet, two excitation coils with different numbers of turns, and an induction coil with the same number of turns as one of the excitation coils. The induction coil is positioned between the two excitation coils. All three coils are wound around the microchannel and embedded within the PDMS substrate. One port of the microchannel serves as the oil inlet, and the other port serves as the oil outlet. The two excitation coils are connected in parallel to the waveform generator, and the two ends of the induction coil are connected to the signal processing circuit. This invention solves the technical problem that existing inductive oil detection technologies cannot directly differentiate metal particles more finely based on the shape of the output signal.

Description

Technical Field

[0001] This invention relates to the field of oil detection and analysis technology, and more particularly to a non-ferrous metal abrasive particle differentiation and detection device, its manufacturing method, and its detection method. Background Technology

[0002] Hydraulic system components are essential products for industries such as construction machinery, engineering vehicles, mining machinery, agricultural machinery, plastics machinery, metallurgical machinery, aviation, and shipbuilding. Hydraulic oil, acting as the lifeblood of mechanical equipment, circulates within the equipment to ensure its normal operation. However, due to wear and tear on the equipment, metal abrasive particles can enter the hydraulic oil, causing contamination, accelerating wear, and ultimately leading to the failure of mechanical parts and hydraulic malfunctions. Therefore, timely and effective testing of the hydraulic oil in mechanical systems is a direct means of preventing accidents and reducing losses. It is worth noting that while most components are made of ferromagnetic materials, to reduce contact friction and improve service life and reliability, the surfaces of friction pairs are specially treated and coated with non-ferromagnetic metal coatings, such as copper alloys and aluminum alloys. According to tribological principles, different abrasive particles correspond to different wear states and wear locations. Accurate analysis of the types of non-ferrous metal contaminants in the lubricating oil can help determine the location of wear.

[0003] Currently, commonly used oil detection methods include optical detection, spectroscopic analysis, ferrography, capacitance detection, and inductive detection. Optical detection utilizes image recognition technology to differentiate between non-ferrous metals, but it has high hardware and software requirements and is costly. Spectroscopic analysis identifies the chemical composition and relative content of substances based on their spectra, and is widely used for detecting oil quality and physicochemical parameters. Ferrography and capacitance detection cannot identify the material of metal particles. Inductive detection uses electromagnetic principles, has a simple structure, and can differentiate between ferromagnetic and non-ferromagnetic metal particles, but it cannot detect a wider range of non-ferrous metals. Summary of the Invention

[0004] Based on the aforementioned issues, existing inductive oil detection technologies focus on improving sensor accuracy and throughput. However, these sensors can only perform simple particle differentiation, distinguishing metal particles into ferromagnetic and non-ferromagnetic particles. They cannot directly differentiate metal particles more finely based on the shape of the output signal. Therefore, this invention provides a non-ferrous metal abrasive particle differentiation and detection device, its manufacturing method, and its detection method. This invention designs an asymmetric three-coil sensor whose output signal has multiple peaks and troughs, enabling the differentiation, detection, and size estimation of abrasive particles made of copper, aluminum, iron, and 304 stainless steel.

[0005] The technical means employed in this invention are as follows:

[0006] A non-ferrous metal abrasive particle differentiation and detection device includes: an asymmetric triple-coil sensor, a signal processing circuit and a waveform generator connected to the asymmetric triple-coil sensor, a data acquisition unit connected to the signal processing circuit and the waveform generator, and a computer connected to the data acquisition unit. The device identifies copper particles, aluminum particles, iron particles, and 304 stainless steel particles and estimates particle size by using phase, amplitude, and the number of peaks and troughs.

[0007] The asymmetric three-coil sensor includes a glass substrate and a chip body disposed on the glass substrate. The chip body includes an oil inlet, a PDMS substrate, a microchannel, an oil outlet, two excitation coils with different numbers of turns, and an induction coil with the same number of turns as one of the excitation coils. In the chip body, the induction coil is disposed between the two excitation coils, and the three coils are respectively wound on the microchannel and embedded inside the PDMS substrate. One port of the microchannel serves as the oil inlet, and the other port serves as the oil outlet.

[0008] The lead wires of the three coils are all set outside the PDMS substrate. The two excitation coils are connected in parallel to the waveform generator. The waveform generator provides sinusoidal excitation signals to the two excitation coils. The two ends of the induction coil are connected to the signal processing circuit to output voltage signals. The data acquisition unit converts the voltage signals into digital signals and displays them on the computer.

[0009] Furthermore, two excitation coils with different numbers of turns are excited by AC signals in opposite directions to provide opposing magnetic fields. The induction coil senses the changes in the magnetic fields of the two excitation coils and converts them into induced electromotive force.

[0010] Furthermore, all three coils are made of copper wire of the same diameter.

[0011] The present invention also provides a method for manufacturing a non-ferrous metal abrasive particle distinguishing and detection device based on the above, comprising:

[0012] A coil is wound with copper wire as the first excitation coil, a coil with the same number of turns as the first excitation coil is wound with copper wire of the same diameter as the induction coil, and a coil with a different number of turns than the first excitation coil is wound with copper wire of the same diameter as the second excitation coil.

[0013] The first excitation coil, the induction coil, and the second excitation coil are arranged side by side in sequence and passed through copper wire to form an asymmetrical three-coil structure;

[0014] An asymmetric three-coil structure is fixed on a glass slide and encased in a mold, wherein the three coil leads of the asymmetric three-coil structure are set outside the mold.

[0015] Mix PDMS and curing agent in a 10:1 ratio and remove air bubbles using a vacuum drying oven;

[0016] Pour the PDMS after removing the air bubbles into the mold, and then put it into a vacuum drying oven to dry for 30 minutes to cure it.

[0017] After curing, the copper wire is pulled out, forming a microchannel, and the asymmetric three-coil sensor is completed.

[0018] The first excitation coil and the second excitation coil are connected in parallel to the waveform generator;

[0019] Connect the two ends of the induction coil to the signal processing circuit;

[0020] Connect the output of the signal processing circuit to the input of the data acquisition unit;

[0021] Connect the output of the data acquisition unit to the computer.

[0022] The present invention also provides a method for distinguishing and detecting non-ferrous metal abrasive particles based on the above-mentioned non-ferrous metal abrasive particle distinguishing and detecting device, comprising:

[0023] Copper particles with diameters of 500μm, 626μm, 760μm and 810μm are introduced into the microchannel through the oil injection port and pass through the first excitation coil, the induction coil and the second excitation coil in sequence. The signal diagram generated by the induction coil is captured.

[0024] Aluminum particles with diameters of 430μm, 500μm, 620μm and 710μm are introduced into the microchannel through the oil injection port and pass through the first excitation coil, the induction coil and the second excitation coil in sequence. The signal diagram generated by the induction coil is captured.

[0025] Iron particles with diameters of 300μm, 510μm, 738μm and 840μm are introduced into the microchannel through the oil injection port and pass through the first excitation coil, the induction coil and the second excitation coil in sequence. The signal diagram generated by the induction coil is captured.

[0026] 304 stainless steel particles with particle sizes of 684μm, 720μm, 940μm and 1020μm are introduced into the microchannel through the oil injection port and pass through the first excitation coil, the induction coil and the second excitation coil in sequence. The signal diagram generated by the induction coil is captured.

[0027] If the initial phase of the signal differs from the phase of the ferromagnetic particle by 180°, the signal is determined to be a non-ferromagnetic particle; calculate the ratio of the peak value to the trough value of the characteristic signal. If the ratio is about 4.6 times, the signal is determined to be a copper particle; if the ratio is about 2 times, the signal is determined to be an aluminum particle.

[0028] If the initial phase of the signal differs from the phase of the non-ferromagnetic particle by 180°, the signal is determined to be a ferromagnetic particle; if the characteristic signal has two peaks and two troughs, and the peaks and troughs are clearly distinct, the signal is determined to be an iron particle; if the characteristic signal has two peaks and one trough, and the signal of the second peak is weak, the signal is determined to be a 304 stainless steel particle.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] The non-ferrous metal abrasive particle differentiation and detection device provided by the present invention uses excitation coils of different specifications to generate an asymmetrical magnetic field, causing particles of different materials to cause different degrees of signal changes in the induction coil, thereby achieving the purpose of differentiating non-ferrous metals and estimating particle size.

[0031] Based on the above reasons, this invention can be widely applied in fields such as oil detection. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a diagram showing the coil distribution of the asymmetric three-coil sensor of the present invention.

[0034] Figure 2 This is a structural diagram of the asymmetric three-coil sensor of the present invention.

[0035] Figure 3 The output signal diagram of the copper particle is provided for an embodiment of the present invention.

[0036] Figure 4 The output signal diagram of aluminum particles provided in the embodiment of the present invention.

[0037] Figure 5 The output signal diagram of iron particles provided in the embodiment of the present invention.

[0038] Figure 6 The output signal diagram of 304 stainless steel particles provided in the embodiment of the present invention.

[0039] Figure 7 A comparison diagram of the signal characteristics of a traditional three-coil sensor and an asymmetric three-coil sensor provided in the embodiments of the present invention.

[0040] In the figure: 1. Oil inlet; 2. Particle; 3. First excitation coil; 4. Induction coil; 5. Second excitation coil; 6. Oil outlet; 7. Glass slide; 8. Microchannel; 9. PDMS substrate. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0045] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0046] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0048] This invention provides a non-ferrous metal abrasive particle differentiation and detection device, comprising: an asymmetric triple-coil sensor, a signal processing circuit and a waveform generator connected to the asymmetric triple-coil sensor, a data acquisition unit connected to the signal processing circuit and the waveform generator, and a computer connected to the data acquisition unit. The device identifies copper particles, aluminum particles, iron particles, and 304 stainless steel particles and estimates particle size by using phase, amplitude, and the number of peaks and troughs.

[0049] like Figure 1 , 2As shown, the asymmetric three-coil sensor includes a glass substrate 7 and a chip body disposed on the glass substrate 7. The chip body includes an oil inlet 1, a PDMS substrate 9, a microchannel 8, an oil outlet 6, two excitation coils with different numbers of turns (a first excitation coil 3 and a second excitation coil 5), and an induction coil 4 with the same number of turns as the first excitation coil 3. In the chip body, the induction coil 4 is disposed between the two excitation coils (the first excitation coil 3 and the second excitation coil 5). The three coils are respectively wound on the microchannel 8 and are all embedded inside the PDMS substrate 9. One port of the microchannel 8 serves as the oil inlet 1, and the other port serves as the oil outlet 6.

[0050] The lead wires of the three coils are all set outside the PDMS substrate 9. The two excitation coils (the first excitation coil 3 and the second excitation coil 5) are connected in parallel to the waveform generator. The waveform generator provides sinusoidal excitation signals to the two excitation coils (the first excitation coil 3 and the second excitation coil 5). The two ends of the induction coil 4 are connected to the signal processing circuit and output voltage signals. The data acquisition unit converts the voltage signals into digital signals and displays them on the computer.

[0051] In a preferred embodiment of the present invention, the first excitation coil 6, the second excitation coil 8, and the induction coil 7 are all wound with copper wire with a diameter of 70 μm. The first excitation coil 6 and the second excitation coil 8 are wound in opposite directions, each with 300 turns and an inner diameter of 1300 μm.

[0052] In a preferred embodiment of this invention, two excitation coils with different numbers of turns (first excitation coil 3 and second excitation coil 5) are excited by AC signals in opposite directions to provide opposing magnetic fields. Induction coil 4 senses the changes in the magnetic fields of the two excitation coils (first excitation coil 3 and second excitation coil 5) and converts them into induced electromotive force. Different particles exhibit different magnetization and eddy current effects in the magnetic field due to their varying electrical and magnetic conductivity. Different types of particles enter the microchannel 8 from the oil inlet 1 and sequentially enter the first excitation coil 3, induction coil 4, and second excitation coil 5. Due to varying degrees of magnetization and eddy current effects, the particles have different influences on the distribution of the magnetic field. The equivalent inductance of induction coil 4 changes differently, enabling the distinguishing detection of different types and sizes of non-ferrous metal abrasive particles.

[0053] In a specific implementation, as a preferred embodiment of the present invention, the three coils (the first excitation coil 3, the induction coil 4, and the second excitation coil 5) are all wound with copper wire of the same diameter.

[0054] This invention provides a method for manufacturing a non-ferrous metal abrasive particle distinguishing and detection device, comprising:

[0055] A coil is wound with copper wire as the first excitation coil 3, a coil with the same number of turns as the first excitation coil 3 is wound with copper wire of the same diameter as the induction coil 4, and a coil with a different number of turns than the first excitation coil 3 is wound with copper wire of the same diameter as the second excitation coil 5.

[0056] The first excitation coil 3, the induction coil 4, and the second excitation coil 5 are arranged side by side in sequence and passed through copper wire to form an asymmetrical three-coil structure;

[0057] The asymmetric three-coil structure is fixed on the glass substrate 7 and wrapped with a mold, wherein the leads of the three coils (first excitation coil 3, induction coil 4 and second excitation coil 5) in the asymmetric three-coil structure are set outside the mold.

[0058] Mix PDMS and curing agent in a 10:1 ratio and remove air bubbles using a vacuum drying oven;

[0059] Pour the PDMS after removing the air bubbles into the mold, and then put it into a vacuum drying oven to dry for 30 minutes to cure it.

[0060] After curing, the copper wire is pulled out, thus forming microchannel 8, and the asymmetric three-coil sensor is completed.

[0061] The first excitation coil 3 and the second excitation coil 5 are connected in parallel to the waveform generator;

[0062] Connect the two ends of the induction coil 4 to the signal processing circuit;

[0063] Connect the output of the signal processing circuit to the input of the data acquisition unit;

[0064] Connect the output of the data acquisition unit to the computer.

[0065] Example

[0066] This invention provides a method for distinguishing and detecting non-ferrous metal abrasive particles based on the above-mentioned non-ferrous metal abrasive particle distinguishing and detecting device, comprising:

[0067] Copper particles with diameters of 500μm, 626μm, 760μm, and 810μm were introduced into the microfluidic channel through the oil injection port and passed sequentially through the first excitation coil, the induction coil, and the second excitation coil. A signal image generated by the induction coil was captured, as shown below. Figure 3 As shown;

[0068] Aluminum particles with diameters of 430μm, 500μm, 620μm, and 710μm were introduced into the microchannel through the oil injection port and passed sequentially through the first excitation coil, the induction coil, and the second excitation coil. A signal image generated by the induction coil was captured, as shown below. Figure 4 As shown;

[0069] Iron particles with diameters of 300 μm, 510 μm, 738 μm, and 840 μm were introduced into the microchannel through the oil injection port and passed sequentially through the first excitation coil, the induction coil, and the second excitation coil. A signal image generated by the induction coil was captured, as shown below. Figure 5 As shown;

[0070] 304 stainless steel particles with diameters of 684μm, 720μm, 940μm, and 1020μm are introduced into the microchannel through the oil injection port and sequentially pass through the first excitation coil, the induction coil, and the second excitation coil. A signal image generated by the induction coil is captured, as shown below. Figure 6 As shown;

[0071] If the initial phase of the signal differs from the phase of the ferromagnetic particle by 180°, the signal is determined to be a non-ferromagnetic particle; calculate the ratio of the peak value to the trough value of the characteristic signal. If the ratio is about 4.6 times, the signal is determined to be a copper particle; if the ratio is about 2 times, the signal is determined to be an aluminum particle.

[0072] If the initial phase of the signal differs from the phase of the non-ferromagnetic particle by 180°, the signal is determined to be a ferromagnetic particle; if the characteristic signal has two peaks and two troughs, and the peaks and troughs are clearly distinct, the signal is determined to be an iron particle; if the characteristic signal has two peaks and one trough, and the signal of the second peak is weak, the signal is determined to be a 304 stainless steel particle.

[0073] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the initial phase of the signal from non-ferromagnetic particles differs from that of ferromagnetic particles by 180°. According to... Figure 3 , Figure 4 Based on the output characteristics of copper and aluminum particles, the peak value of the copper particle signal is much larger than the trough value, with a ratio generally around 4.6. For aluminum particles, the ratio is around 2. Therefore, the phase of the signal can be used to first determine whether the particle is non-ferromagnetic. The shape of the output signal (the ratio of positive to negative pulse values) can further distinguish between copper and aluminum particles. The amplitude of the signal can determine the particle size.

[0074] like Figure 5 As shown, when iron particles pass through the sensor, two larger peaks and troughs first appear, followed by two smaller peaks and troughs. Figure 6As shown, when 304 stainless steel particles pass through the sensor, a relatively obvious peak and trough are generated, with the second peak being weaker, and the overall signal is positive. Therefore, the phase of the signal can be used to first determine whether the particles are ferromagnetic, the shape of the signal can distinguish between iron particles and 304 stainless steel particles, and the amplitude of the signal can determine the size of the particles.

[0075] In summary, the asymmetric three-coil sensor proposed in this invention produces a different output signal compared to traditional three-coil sensors, such as... Figure 7 As shown. Traditional three-coil sensors use three identical coils as the excitation coil, induction coil, and excitation coil. When detecting particles, the output voltage signal has only one peak and trough, and can only roughly distinguish between ferromagnetic and non-ferromagnetic particles. The distinction between these two types of particles lies in the difference in the initial phase of the output signal; the initial phases of ferromagnetic and non-ferromagnetic particles differ by 180°. In contrast, the asymmetric three-coil sensor designed in this invention produces an output signal with multiple peaks and troughs, increasing the number of characteristic points of the signal and aiding in signal recognition. Furthermore, different particle materials result in different peaks, troughs, and signal shapes in the output signal. By analyzing the output signal waveform, not only can ferromagnetic and non-ferromagnetic particles be distinguished, but particles of the same material can also be further differentiated.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-ferrous metal abrasive particle differentiation and detection device, characterized in that, include: An asymmetric three-coil sensor, a signal processing circuit and waveform generator connected to the asymmetric three-coil sensor, a data acquisition unit connected to the signal processing circuit and waveform generator, and a computer connected to the data acquisition unit are used to identify copper particles, aluminum particles, iron particles, and 304 stainless steel particles, and estimate their particle size by measuring phase, amplitude, and the number of peaks and troughs. The asymmetric three-coil sensor includes a glass substrate and a chip body disposed on the glass substrate. The chip body includes an oil inlet, a PDMS substrate, a microchannel, an oil outlet, two excitation coils with different numbers of turns, and an induction coil with the same number of turns as one of the excitation coils. In the chip body, the induction coil is disposed between the two excitation coils, and the three coils are respectively wound on the microchannel and embedded inside the PDMS substrate. One port of the microchannel serves as the oil inlet, and the other port serves as the oil outlet. The lead wires of the three coils are all set outside the PDMS substrate. The two excitation coils are connected in parallel to the waveform generator. The waveform generator provides sinusoidal excitation signals to the two excitation coils. The two ends of the induction coil are connected to the signal processing circuit to output voltage signals. The data acquisition unit converts the voltage signals into digital signals and displays them on the computer.

2. The non-ferrous metal abrasive particle differentiation and detection device according to claim 1, characterized in that, Two excitation coils with different numbers of turns are excited by AC signals in opposite directions to provide opposing magnetic fields. The induction coil senses the changes in the magnetic fields of the two excitation coils and converts them into induced electromotive force.

3. The non-ferrous metal abrasive particle differentiation and detection device according to claim 1, characterized in that, All three coils are made of copper wire of the same diameter.

4. A method for manufacturing a non-ferrous metal abrasive particle distinguishing and detection device based on any one of claims 1-3, characterized in that, include: A coil is wound with copper wire as the first excitation coil, a coil with the same number of turns as the first excitation coil is wound with copper wire of the same diameter as the induction coil, and a coil with a different number of turns than the first excitation coil is wound with copper wire of the same diameter as the second excitation coil. The first excitation coil, the induction coil, and the second excitation coil are arranged side by side in sequence and passed through copper wire to form an asymmetrical three-coil structure; An asymmetric three-coil structure is fixed on a glass slide and encased in a mold, wherein the three coil leads of the asymmetric three-coil structure are set outside the mold. Mix PDMS and curing agent in a 10:1 ratio and remove air bubbles using a vacuum drying oven; Pour the PDMS after removing the air bubbles into the mold, and then put it into a vacuum drying oven to dry for 30 minutes to cure it. After curing, the copper wire is pulled out, forming a microchannel, and the asymmetric three-coil sensor is completed. The first excitation coil and the second excitation coil are connected in parallel to the waveform generator; Connect the two ends of the induction coil to the signal processing circuit; Connect the output of the signal processing circuit to the input of the data acquisition unit; Connect the output of the data acquisition unit to the computer.

5. A method for distinguishing and detecting non-ferrous metal abrasive particles based on the non-ferrous metal abrasive particle distinguishing and detecting device according to any one of claims 1-3, characterized in that, include: Copper particles with diameters of 500μm, 626μm, 760μm and 810μm are introduced into the microchannel through the oil injection port and pass through the first excitation coil, the induction coil and the second excitation coil in sequence. The signal diagram generated by the induction coil is captured. Aluminum particles with diameters of 430μm, 500μm, 620μm and 710μm are introduced into the microchannel through the oil injection port and pass through the first excitation coil, the induction coil and the second excitation coil in sequence. The signal diagram generated by the induction coil is captured. Iron particles with diameters of 300μm, 510μm, 738μm and 840μm are introduced into the microchannel through the oil injection port and pass through the first excitation coil, the induction coil and the second excitation coil in sequence. The signal diagram generated by the induction coil is captured. 304 stainless steel particles with particle sizes of 684μm, 720μm, 940μm and 1020μm are introduced into the microchannel through the oil injection port and pass through the first excitation coil, the induction coil and the second excitation coil in sequence. The signal diagram generated by the induction coil is captured. If the initial phase of the signal differs from the phase of the ferromagnetic particle by 180°, the signal is determined to be a non-ferromagnetic particle; calculate the ratio of the peak value to the trough value of the characteristic signal. If the ratio is about 4.6 times, the signal is determined to be a copper particle; if the ratio is about 2 times, the signal is determined to be an aluminum particle. If the initial phase of the signal differs from the phase of the non-ferromagnetic particle by 180°, the signal is determined to be a ferromagnetic particle; if the characteristic signal has two peaks and two troughs, and the peaks and troughs are clearly distinct, the signal is determined to be an iron particle; if the characteristic signal has two peaks and one trough, and the signal of the second peak is weak, the signal is determined to be a 304 stainless steel particle.

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